19 lines
763 B
Rust
19 lines
763 B
Rust
// Some optimizations remove ZST accesses, thus masking this UB.
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// compile-flags: -Zmir-opt-level=0
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fn main() {
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// Not using the () type here, as writes of that type do not even have MIR generated.
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// Also not assigning directly as that's array initialization, not assignment.
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let zst_val = [1u8; 0];
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// make sure ZST accesses are checked against being "truly" dangling pointers
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// (that are out-of-bounds).
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let mut x_box = Box::new(1u8);
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let x = (&mut *x_box as *mut u8).wrapping_offset(1);
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// This one is just "at the edge", but still okay
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unsafe { *(x as *mut [u8; 0]) = zst_val; }
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// One byte further is OOB.
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let x = x.wrapping_offset(1);
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unsafe { *(x as *mut [u8; 0]) = zst_val; } //~ ERROR out-of-bounds
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}
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